September 27, 1919

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Features

The Revival of the American Monitor, Iron Ores Formed By Bacteria

Chaining the Missouri

How the Tubular Concrete Pile Has Been Used to Check the River's Inroads on Its Banks

By H. T. Dobbins

The Desert Sign Post

Opening Up America's Waste Lands by Aid of the Painted Word Photos by United States Geological Survey

By H. C. Hardy

The Stop-Watch in Industry

Some Reasons for Believing That It Is Out of Place There

By C. E. Knoeppel

Research in Refractories

Some of the Mistakes Which Are Avoided by Full Use of What Science Can Tell

The Lesson of the Caldwell Range

Governmental Encouragement of Rifle Practice in Time of Peace Vital for National Security

By R. G. Skerrett

Our Technical Achievements in the Great War--Concluding Chapter

The Share of the Various Armies in Bringing About the Final Victory

Asbestos Mines of Quebec

How Nature Put the Mineral Fiber in the Rock, and How Man Gets It Out

By W. F. Sutherland

Sells Fresh Fruit Juice, What Are Naval Stores?

The Balanced Ration on the Poultry Farm, The Current Supplement

Departments

Departments

Correspondence - September 27, 1919

The Heavens in October 1919

Inventions New and Interesting - September 27, 1919

Recently Patented Inventions - September 27, 1919

New Books, Etc.

Notes and Queries

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